. >>> right now, president obama is en route to south africa, he will speak at tomorrow's memorial service for nelson mandela. joining him is former president george w. bush, bill clinton and jimmy carter will also attend. these are live pictures from johannesburg. thousands of people have left remembrances. >>> alfonzo van marsh is in suetto, where close to a thousand people are expected at tomorrow's remembrance services. >> reporter: gathering in south africa, remembering the man who helped reshape their nation. the first official tribute to nelson mandela happened on tuesday. president and michelle obama boarded air force one this morning on the way to attend the service. former presidents bush, clinton, and carter will be there as well, under tight security. outside mandela's former home, crowds are pouring out their love. massive billboards are filling up with messages of gratitude for mandela, like this one in france. down here, emma says thank you for all you've done to change south africa and the rest of the world. american photographer, darrell todd wanted to capture the mood her